LXR linux/arch/sparc/include/asm/thread_info

   1/*
   2 * thread_info.h: sparc low-level thread information
   3 * adapted from the ppc version by Pete Zaitcev, which was
   4 * adapted from the i386 version by Paul Mackerras
   5 *
   6 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   7 * Copyright (c) 2002  Pete Zaitcev (zaitcev@yahoo.com)
   8 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   9 */
  10
  11#ifndef _ASM_THREAD_INFO_H
  12#define _ASM_THREAD_INFO_H
  13
  14#ifdef __KERNEL__
  15
  16#ifndef __ASSEMBLY__
  17
  18#include <asm/ptrace.h>
  19#include <asm/page.h>
  20
  21/*
  22 * Low level task data.
  23 *
  24 * If you change this, change the TI_* offsets below to match.
  25 */
  26#define NSWINS 8
  27struct thread_info {
  28        unsigned long           uwinmask;
  29        struct task_struct      *task;          /* main task structure */
  30        struct exec_domain      *exec_domain;   /* execution domain */
  31        unsigned long           flags;          /* low level flags */
  32        int                     cpu;            /* cpu we're on */
  33        int                     preempt_count;  /* 0 => preemptable,
  34                                                   <0 => BUG */
  35        int                     softirq_count;
  36        int                     hardirq_count;
  37
  38        /* Context switch saved kernel state. */
  39        unsigned long ksp;      /* ... ksp __attribute__ ((aligned (8))); */
  40        unsigned long kpc;
  41        unsigned long kpsr;
  42        unsigned long kwim;
  43
  44        /* A place to store user windows and stack pointers
  45         * when the stack needs inspection.
  46         */
  47        struct reg_window32     reg_window[NSWINS];     /* align for ldd! */
  48        unsigned long           rwbuf_stkptrs[NSWINS];
  49        unsigned long           w_saved;
  50
  51        struct restart_block    restart_block;
  52};
  53
  54/*
  55 * macros/functions for gaining access to the thread information structure
  56 */
  57#define INIT_THREAD_INFO(tsk)                           \
  58{                                                       \
  59        .uwinmask       =       0,                      \
  60        .task           =       &tsk,                   \
  61        .exec_domain    =       &default_exec_domain,   \
  62        .flags          =       0,                      \
  63        .cpu            =       0,                      \
  64        .preempt_count  =       INIT_PREEMPT_COUNT,     \
  65        .restart_block  = {                             \
  66                .fn     =       do_no_restart_syscall,  \
  67        },                                              \
  68}
  69
  70#define init_thread_info        (init_thread_union.thread_info)
  71#define init_stack              (init_thread_union.stack)
  72
  73/* how to get the thread information struct from C */
  74register struct thread_info *current_thread_info_reg asm("g6");
  75#define current_thread_info()   (current_thread_info_reg)
  76
  77/*
  78 * thread information allocation
  79 */
  80#define THREAD_SIZE_ORDER  1
  81
  82#endif /* __ASSEMBLY__ */
  83
  84/* Size of kernel stack for each process */
  85#define THREAD_SIZE             (2 * PAGE_SIZE)
  86
  87/*
  88 * Offsets in thread_info structure, used in assembly code
  89 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
  90 */
  91#define TI_UWINMASK     0x00    /* uwinmask */
  92#define TI_TASK         0x04
  93#define TI_EXECDOMAIN   0x08    /* exec_domain */
  94#define TI_FLAGS        0x0c
  95#define TI_CPU          0x10
  96#define TI_PREEMPT      0x14    /* preempt_count */
  97#define TI_SOFTIRQ      0x18    /* softirq_count */
  98#define TI_HARDIRQ      0x1c    /* hardirq_count */
  99#define TI_KSP          0x20    /* ksp */
 100#define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
 101#define TI_KPSR         0x28    /* kpsr */
 102#define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
 103#define TI_REG_WINDOW   0x30
 104#define TI_RWIN_SPTRS   0x230
 105#define TI_W_SAVED      0x250
 106/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
 107
 108#define PREEMPT_ACTIVE          0x4000000
 109
 110/*
 111 * thread information flag bit numbers
 112 */
 113#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 114#define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 115#define TIF_SIGPENDING          2       /* signal pending */
 116#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 117#define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 118#define TIF_USEDFPU             8       /* FPU was used by this task
 119                                         * this quantum (SMP) */
 120#define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
 121                                         * TIF_NEED_RESCHED */
 122#define TIF_MEMDIE              10      /* is terminating due to OOM killer */
 123
 124/* as above, but as bit values */
 125#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 126#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 127#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 128#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 129#define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 130#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 131
 132#define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | \
 133                                         _TIF_SIGPENDING)
 134
 135#endif /* __KERNEL__ */
 136
 137#endif /* _ASM_THREAD_INFO_H */
 138